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Index of 8^n within sequence of numbers of form 7^i*8^j.
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%I #8 May 18 2022 07:54:01

%S 1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,137,155,174,194,215,237,

%T 260,284,309,335,362,390,419,449,480,513,547,582,618,655,693,732,772,

%U 813,855,898,942,987,1033,1081,1130,1180,1231,1283,1336,1390,1445,1501,1558,1616

%N Index of 8^n within sequence of numbers of form 7^i*8^j.

%Y Cf. A001018, A036566.

%K nonn

%O 1,2

%A _David W. Wilson_